Pröschel P A, Maul T, Morneburg T
University Dental Clinic, Department of Prosthodontics, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany.
Int J Prosthodont. 2000 Jul-Aug;13(4):303-10.
Functional relationships between occlusal errors and articulator settings have been the subject of numerous investigations. It is, however, not known how frequently errors of a certain size occur under practical conditions. This study attempted to estimate the frequency of occlusal errors that can be expected with the different levels of registration and articulator adjustment that are currently used.
In 57 asymptomatic subjects, individual articulation parameters, including the condylar and Bennett angles, the spatial relation of dental arches, and the intercondylar distance, were determined experimentally. Tooth-guided lateral movements of the subjects' casts were simulated in a virtual articulator that was programmed to the individual parameters of each person. With respect to this reference setting, occlusal errors that would emerge with different modes of semi-individual adjustment were calculated. The intercondylar distance thereby remained fixed at 110 mm.
With complete mean value setting, occlusal errors would exceed 200 microns at the second molar in 16% of the subjects and 300 microns in 6% of the subjects. Individual facebow registration of condylar angles and spatial relations would reduce these rates to 13% (200 microns) and 3% (300 microns). With additional setting of Bennett angles, occlusal errors would exceed the mentioned limits in no more than 1.6% and 0.1% of cases, respectively. This extensive mode of adjustment became, however, increasingly ineffective with higher demands for occlusal accuracy.
Complete mean value setting is associated with a relatively low risk of occlusal errors exceeding tolerance limits that are widely accepted in practice. Compared to mean value setting, facebow registration of condylar angle and relations yields no profitable improvement of occlusal accuracy.
咬合误差与牙合架设置之间的功能关系一直是众多研究的主题。然而，在实际情况下，特定大小的误差出现的频率尚不清楚。本研究试图估计在当前使用的不同登记水平和牙合架调整情况下可能出现的咬合误差频率。
对57名无症状受试者进行实验，确定包括髁突角和贝内特角、牙弓的空间关系以及髁间距离在内的个体关节运动参数。在一个根据每个人的个体参数编程的虚拟牙合架中模拟受试者模型的牙引导侧向运动。相对于此参考设置，计算了不同半个体调整模式下会出现的咬合误差。髁间距离固定为110毫米。
采用完全平均值设置时，16%的受试者第二磨牙处的咬合误差将超过200微米，6%的受试者超过300微米。个体髁突角和空间关系的面弓记录将这些比率分别降至13%（200微米）和3%（300微米）。额外设置贝内特角后，咬合误差分别超过上述限度的情况不超过1.6%和0.1%。然而，随着对咬合精度要求的提高，这种广泛的调整方式变得越来越无效。
完全平均值设置与咬合误差超过实际中广泛接受的公差极限的风险相对较低相关。与平均值设置相比，髁突角和面弓记录对咬合精度没有显著改善。
